No. 6,201 in German
deren
"Deren" is a German relative pronoun meaning "whose" (feminine or plural).
In a sentence
Das ist die Frau, deren Kinder ich unterrichte.
This is the woman whose children I teach.
In this sentence, 'deren' is used as a relative pronoun in the genitive case referring to 'die Frau' and her children.
Die Stadt, deren Geschichte mich interessiert, ist sehr alt.
The city whose history interests me is very old.
Here, 'deren' is also a relative pronoun in the genitive case, referring to 'die Stadt' and its history.
Der Junge kennt das Mädchen, deren Buch auf dem Tisch liegt.
The boy knows the girl whose book lies on the table.
Again, 'deren' functions as a genitive relative pronoun referring to 'das Mädchen' and her book.
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